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Math::PI Field
Visual Studio 2010
Represents the ratio of the circumference of a circle to its diameter, specified by the constant, π.
Assembly: mscorlib (in mscorlib.dll)
The following example uses PI to assist in the computation of the inner angles of a given trapezoid.
/// <summary> /// The following class represents simple functionality of the trapezoid. /// </summary> public ref class MathTrapezoidSample { private: double m_longBase; double m_shortBase; double m_leftLeg; double m_rightLeg; public: MathTrapezoidSample( double longbase, double shortbase, double leftLeg, double rightLeg ) { m_longBase = Math::Abs( longbase ); m_shortBase = Math::Abs( shortbase ); m_leftLeg = Math::Abs( leftLeg ); m_rightLeg = Math::Abs( rightLeg ); } private: double GetRightSmallBase() { return (Math::Pow( m_rightLeg, 2.0 ) - Math::Pow( m_leftLeg, 2.0 ) + Math::Pow( m_longBase, 2.0 ) + Math::Pow( m_shortBase, 2.0 ) - 2 * m_shortBase * m_longBase) / (2 * (m_longBase - m_shortBase)); } public: double GetHeight() { double x = GetRightSmallBase(); return Math::Sqrt( Math::Pow( m_rightLeg, 2.0 ) - Math::Pow( x, 2.0 ) ); } double GetSquare() { return GetHeight() * m_longBase / 2.0; } double GetLeftBaseRadianAngle() { double sinX = GetHeight() / m_leftLeg; return Math::Round( Math::Asin( sinX ), 2 ); } double GetRightBaseRadianAngle() { double x = GetRightSmallBase(); double cosX = (Math::Pow( m_rightLeg, 2.0 ) + Math::Pow( x, 2.0 ) - Math::Pow( GetHeight(), 2.0 )) / (2 * x * m_rightLeg); return Math::Round( Math::Acos( cosX ), 2 ); } double GetLeftBaseDegreeAngle() { double x = GetLeftBaseRadianAngle() * 180 / Math::PI; return Math::Round( x, 2 ); } double GetRightBaseDegreeAngle() { double x = GetRightBaseRadianAngle() * 180 / Math::PI; return Math::Round( x, 2 ); } }; int main() { MathTrapezoidSample^ trpz = gcnew MathTrapezoidSample( 20.0,10.0,8.0,6.0 ); Console::WriteLine( "The trapezoid's bases are 20.0 and 10.0, the trapezoid's legs are 8.0 and 6.0" ); double h = trpz->GetHeight(); Console::WriteLine( "Trapezoid height is: {0}", h.ToString() ); double dxR = trpz->GetLeftBaseRadianAngle(); Console::WriteLine( "Trapezoid left base angle is: {0} Radians", dxR.ToString() ); double dyR = trpz->GetRightBaseRadianAngle(); Console::WriteLine( "Trapezoid right base angle is: {0} Radians", dyR.ToString() ); double dxD = trpz->GetLeftBaseDegreeAngle(); Console::WriteLine( "Trapezoid left base angle is: {0} Degrees", dxD.ToString() ); double dyD = trpz->GetRightBaseDegreeAngle(); Console::WriteLine( "Trapezoid left base angle is: {0} Degrees", dyD.ToString() ); }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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